Difference between MERGE and Update/Insert

Can anybody pls tell me what is the difference between MERGE and Update/Insert statements.

hi vivek,
merge is totally different than normal update and insert.Merge is a combination of update+inserrt.
Merge statment first checks the data in your table, if data is already exists then it will try to update the data otherwise it will go for insertion.In case of normal update/insert it will not check the data directly it does the specified operation.
So based on your requirement you have to select the best option.
Thanks.

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hi
what is difference between mofify and update
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the three fields are
cus no
status
date these all are primary key in the database table
so which sould i use modify or update
there might be entry already existing in database table or new entry to be created if already existin it should check on the primary keys and updatat if not it should add a record
pls suggest whihc to use and how to implement the check on teh threee primary key
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now where condition ? can be used or not with modify? and if yes how
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regards
Arora

Hi Nishant Arora,
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They are: Insert + Update.
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Go through this links please.,
http://help.sap.com/saphelp_nw04/helpdata/en/e7/968aa8b2384dd9835f91e7f8470064/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/fc/eb35eb358411d1829f0000e829fbfe/content.htm
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Hi,
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Please refer to this Link [Document Formats for the Receiver JDBC Adapter|http://help.sap.com/saphelp_nw04/Helpdata/EN/22/b4d13b633f7748b4d34f3191529946/frameset.htm]
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Any ideas please...
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Whats the difference between ALL and FIRST in Multi Inserting

SQL> Drop Table Sales;
Table dropped.
SQL> Drop Table Accounts;
Table dropped.
SQL> Drop Table Research;
Table dropped.
SQL> Create Table Sales As Select * From Emp;
Table created.
SQL> Create Table Accounts As Select * From Emp;
Table created.
SQL> Create Table Research As Select * From Emp;
Table created.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Select * From Sales;
no rows selected
SQL> Select * From Accounts;
no rows selected
SQL> Select * From Research;
no rows selected
SQL> Insert All
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 .
SQL> /
16 rows created.
SQL> Select * From Sales;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7782 CLARK      MANAGER        7839 09-JUN-81       100                  10
     7839 KING       PRESIDENT           17-NOV-81       100                  10
     7934 MILLER     CLERK          7782 23-JAN-82       100                  10
     7999 ABCDEFGH   JOB            7839 09-FEB-06       100         0        10
4 rows selected.
SQL> Select * From Accounts;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7901 SMITH      CLERK          7902 17-DEC-80       100                  20
     7566 JONES      MANAGER        7839 02-APR-81       100                  20
     7788 SCOTT      ANALYST        7566 19-APR-87       100                  20
     7876 ADAMS      CLERK          7788 23-MAY-87       100                  20
     7902 FORD       ANALYST        7566 03-DEC-81       100                  20
      123                                                                     20
6 rows selected.
SQL> Select * From Research;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7499 ALLEN      SALESMAN       7698 20-FEB-81       100       300        30
     7521 WARD       SALESMAN       7698 22-FEB-81       100       500        30
     7654 MARTIN     SALESMAN       7698 28-SEP-81       100      1400        30
     7698 BLAKE      MANAGER        7839 01-MAY-81       100                  30
     7844 TURNER     SALESMAN       7698 08-SEP-81       100         0        30
     7900 JAMES      MANAGER        7698 03-DEC-81       100                  30
6 rows selected.
SQL> Truncate Table Sales;
Table truncated.
SQL> Truncate Table Accounts;
Table truncated.
SQL> Truncate Table Research;
Table truncated.
SQL> Insert First
2 When Deptno=10 Then
3 Into Sales (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
4 When Deptno=20 Then
5 Into Accounts (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
6 When Deptno=30 Then
7 Into Research (Empno,Ename,Job,Mgr,Hiredate,Sal,Comm,DeptNo)
8 Select * From Emp
9 /
16 rows created.
SQL> Select * From Sales;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7782 CLARK      MANAGER        7839 09-JUN-81       100                  10
     7839 KING       PRESIDENT           17-NOV-81       100                  10
     7934 MILLER     CLERK          7782 23-JAN-82       100                  10
     7999 ABCDEFGH   JOB            7839 09-FEB-06       100         0        10
4 rows selected.
SQL> Select * From Accounts;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7901 SMITH      CLERK          7902 17-DEC-80       100                  20
     7566 JONES      MANAGER        7839 02-APR-81       100                  20
     7788 SCOTT      ANALYST        7566 19-APR-87       100                  20
     7876 ADAMS      CLERK          7788 23-MAY-87       100                  20
     7902 FORD       ANALYST        7566 03-DEC-81       100                  20
      123                                                                     20
6 rows selected.
SQL> Select * From Research;
    EMPNO ENAME      JOB             MGR HIREDATE        SAL      COMM    DEPTNO
     7499 ALLEN      SALESMAN       7698 20-FEB-81       100       300        30
     7521 WARD       SALESMAN       7698 22-FEB-81       100       500        30
     7654 MARTIN     SALESMAN       7698 28-SEP-81       100      1400        30
     7698 BLAKE      MANAGER        7839 01-MAY-81       100                  30
     7844 TURNER     SALESMAN       7698 08-SEP-81       100         0        30
     7900 JAMES      MANAGER        7698 03-DEC-81       100                  30
6 rows selected.Both inserting insert the same records then whats the difference between ALL and FIRST clause in multi insert DML
Khurram Siddiqui
[email protected]

Hello
From the docs:
ALL
If you specify ALL, then Oracle evaluates each WHEN clause regardless of the results of the evaluation of any other WHEN clause. For each WHEN clause whose condition evaluates to true, Oracle executes the corresponding INTO clause list.
FIRST
If you specify FIRST, then Oracle evaluates each WHEN clause in the order in which it appears in the statement. For the first WHEN clause that evaluates to true, Oracle executes the corresponding INTO clause and skips subsequent WHEN clauses for the given row.
ELSE clause
For a given row, if no WHEN clause evaluates to true:
* If you have specified an ELSE clause, then Oracle executes the INTO clause list associated with the ELSE clause.
* If you did not specify an else clause, then Oracle takes no action for that row.
See Also:
"Multitable Inserts: Examples"
Restrictions on Multitable Inserts
* You can perform multitable inserts only on tables, not on views or materialized views.
* You cannot perform a multitable insert into a remote table.
* You cannot specify a table collection expression when performing a multitable insert.
* In a multitable insert, all of the insert_into_clauses cannot combine to specify more than 999 target columns.
* Multitable inserts are not parallelized in a Real Application Clusters environment, or if any target table is index organized, or if any target table has a bitmap index defined on it.
* Plan stability is not supported for multitable insert statements.
* The subquery of the multitable insert statement cannot use a sequence.
So given this the following example shows the difference:
SQL> CREATE TABLE dt_test_insert_base as select rownum id from dba_objects where rownum <=20
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_1 (id number)
2 /
Table created.
SQL> CREATE TABLE dt_test_insert_2 (id number)
2 /
Table created.
SQL>
SQL> INSERT ALL
2     WHEN rownum <=15 THEN
3             INTO dt_test_insert_1 (id)
4     WHEN rownum >=10 THEN
5             INTO dt_test_insert_2 (id)
6 SELECT
7     ID
8 FROM
9     dt_test_insert_base
10 /
26 rows created.
SQL>
SQL> SELECT * from dt_test_insert_1
2 /
        ID
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
        11
        12
        13
        14
        15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
        ID
        10
        11
        12
        13
        14
        15
        16
        17
        18
        19
        20
11 rows selected.
SQL>
SQL> TRUNCATE TABLE dt_test_insert_1
2 /
Table truncated.
SQL> TRUNCATE TABLE dt_test_insert_2
2 /
Table truncated.
SQL>
SQL> INSERT FIRST
2     WHEN rownum <=15 THEN
3             INTO dt_test_insert_1 (id)
4     WHEN rownum >=10 THEN --This condition is ignored until the value of id is > 15
5             INTO dt_test_insert_2 (id)
6 SELECT
7     ID
8 FROM
9     dt_test_insert_base
10 /
20 rows created.
SQL> SELECT * from dt_test_insert_1
2 /
        ID
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
        11
        12
        13
        14
        15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
        ID
        16
        17
        18
        19
        20HTH
David

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http://help.sap.com/saphelp_bw33/helpdata/en/3f/548c9ec754ee4d90188a4f108e0121/frameset.htm
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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/cccad390-0201-0010-5093-fd9ec8157802
How to load data
/people/sap.user72/blog/2004/12/16/logistic-cockpit-delta-mechanism--episode-one-v3-update-the-145serializer146
/people/sap.user72/blog/2004/12/23/logistic-cockpit-delta-mechanism--episode-two-v3-update-when-some-problems-can-occur
/people/sap.user72/blog/2005/01/19/logistic-cockpit-delta-mechanism--episode-three-the-new-update-methods
Delta Types and methods;&#57245;
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****Assign Points if Helpful*****
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Which one is faster loading type between Insert/Update and Update/Insert?

Hi Gurus,
Could anyone tell me which loading type faster between Insert/Update and Update/Insert?Any resolution and document reference would be grateful.
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Joni

910575 wrote:
Thanks Purvesh for your quick response..
Yes you are right, we have to prefer sql rather than plsql. But if i have 1 lakh records to be inserted then my insert into select will do insert one by one that mean context switching is more to server i.e 1 lakh.
If i use BULK COLLECT+ FORALL then in a single switch the lakh records will be inserted right?
I agree that when we have less number of records to insert we can prefer insert into select, if we have huge data then why not FORALL ?
You have just tested for 107 records, but in huge data it is different right?
Thanks,
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Hi all,
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Hi,
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Regards

Is pk recommended for update speed and update/insert v merge performance

Hi there,
We are looking to merge 50,000 rows or so into a table each day.
What is generally faster merge or 2 separate sqls (1 to insetrt and 1 to update). Like the merge command but wonder about performance vs the 2 sqls.
Also with both merge and update is it quicker to try match on a pk or would matching on other unique indexes be just as quick.
Many Thanks

Hi,
What is generally faster merge or 2 separate sqls (1 to insetrt and 1 to update)I would say, if you can do it on one operation, do it. But it should be easy for you to try it out.
Also with both merge and update is it quicker to try match on a pk or would matching on other unique indexes be just as quickYou aren't really matching on pk, since this is just a constraint. However, all PK constrains are backed by a unique index, so it should be the same.
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Hi,
APO
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BW is the data layer for APO.
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http://www.sap.com/solutions/business-suite/scm/pdf/BWP_APO40.pdf
http://help.sap.com/saphelp_apo/helpdata/en/7e/63fc37004d0a1ee10000009b38f8cf/frameset.htm
http://help.sap.com/bp_biv133/documentation/BW/I18_Scen_InstallGuide_EN_DE.doc
http://help.sap.com/saphelp_scm41/helpdata/en/92/dd013872af2946e10000009b38f8cf/content.htm
http://help.sap.com/saphelp_apo/helpdata/en/7e/63fc37004d0a1ee10000009b38f8cf/frameset.htm
R/3 OLTP
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Current data
Short database transactions
Online update/insert/delete
Normalization is promoted
High volume transactions
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http://en.wikipedia.org/wiki/OLTP
Refer for OLTP Vs OLAP
compare to r/3, what are the benefits available for b/w
R/3 and BW reports
http://www.geekinterview.com/question_details/209
http://blogs.netindonesia.net/kiki/archive/2006/02/28/8822.aspx
What's the Difference Between OLAP and OLTP?
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Difference between MERGE and Update/Insert

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